text: Dithiophosphate has the formula [POS], which has C symmetry. Sodium dithiophosphate, which is colorless, is the major product from the reaction of phosphorus pentasulfide with NaOH:
  :PS + 6 NaOH → 2 NaPOS + HS + 2 HO
  Dithiophosphoric acid is obtained by treatment of barium dithiophosphate with sulfuric acid:
  :Ba(POS) + 3 HSO → 3 BaSO + 2 HPOS
  Both NaPOS and especially HPOS are prone toward hydrolysis to their monothio derivatives.